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1- List or series of people who have been excluded from a group, an association, etc. , considering them undesirable or unpleasant persons. 2- It is a database where all those IPs and email addresses that are considered illegitimate or that have been reported for irregular activities are stored. 3- In some mobile phones the blacklist is a submenu of the application "contacts", and in this list you can store those phone numbers that are commonly used to send unwanted advertising.